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  • 1.
    Arzel, Céline
    et al.
    Department of Biology, University of Turku.
    Dessborn, Lisa
    Högskolan Kristianstad, Sektionen för lärande och miljö.
    Nummi, Petri
    Pöysä, Hannu
    Elmberg, Johan
    Högskolan Kristianstad, Sektionen för lärande och miljö.
    Sjöberg, Kjell
    Does changing spring phenology affect short and long distance migratory waterfowl similarly?2010Ingår i: The abstract book: Symposium : The global environmental change: messages from birds. Espoo, 17-19 November, 2010, s. 43-Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    Among waterfowl, most ducks may be considered income breeders due to their small body size and their limited capacity to store energy. Therefore limited access to resources on their breeding grounds is likely to affect their breeding schedule and potentially output. At northern latitudes, ice break up dictates the access to the breeding lakes. An early ice break up allows for early access to the breeding site and its feeding resources, and potentially leading to higher breeding output than after a late ice break up. Short distance migrants are thus more likely to adapt to ice break up conditions than long distance migrants which have to cope with weather conditions en route and local resource accessibility along the migratory path. Using 20 years of data on breeding phenology and success of 3 species of ducks differing in their migratory strategy - Teal Anas crecca, Mallard Anas platyrhynchos and Common Goldeneye Bucephala clangula - in a watershed in Finland, we test the idea that variation in spring phenology affects the reproductive performance of duck species differently depending on their migration pattern.

  • 2.
    Arzel, Céline
    et al.
    Finland.
    Dessborn, Lisa
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap.
    Nummi, Petri
    Finland.
    Pöysä, Hannu
    Finland.
    Elmberg, Johan
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap.
    Sjöberg, Kjell
    SLU, Umeå.
    Effect of the timing of spring thaw on the breeding performance in two sympatric bird species: does migration distance matter?2011Konferensbidrag (Refereegranskat)
  • 3.
    Arzel, Céline
    et al.
    University of Turku.
    Dessborn, Lisa
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Man and Biosphere Health (MABH).
    Pöysä, Hannu
    Joensuu Game and Fisheries Research.
    Elmberg, Johan
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Man and Biosphere Health (MABH).
    Nummi, Petri
    University of Helsinki.
    Sjöberg, Kjell
    Swedish University of Agricultural Sciences, Umeå.
    Early springs and breeding performance in two sympatric duck species with different migration strategies2014Ingår i: Ibis, ISSN 0019-1019, E-ISSN 1474-919X, Vol. 156, nr 2, s. 288-298Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The capacity of migratory species to adapt to climate change may depend on their migratory and reproductive strategies. For example, reproductive output is likely to be influenced by how well migration and nesting are timed to temporal patterns of food abundance, or by temperature variations during the brood rearing phase. Based on two decades (1988–2009) of waterfowl counts from a boreal catchment in southern Finland we assessed how variation in ice break-up date affected nesting phenology and breeding success in two sympatric duck species, Mallard Anas platyrhynchos and Eurasian Teal Anas crecca. In Fennoscandia these species have similar breeding habitat requirements but differ in migration distance; Teal migrate roughly seven times as far as do Mallard. Annual ice break-up date was used as a proxy of spring ‘earliness’ to test the potential effect of climate change on hatching timing and breeding performance. Both species were capable of adapting their nesting phenology, and bred earlier in years when spring was early. However, the interval from ice break-up to hatching tended to be longer in early springs in both species, so that broods hatched relatively later than in late springs. Ice break-up date did not appear to influence annual number of broods per pair or annual mean brood size in either species. Our study therefore does not suggest that breeding performance in Teal and Mallard is negatively affected by advancement of ice break-up at the population level. However, both species showed a within-season decline in brood size with increasing interval between ice break-up and hatching. Our study therefore highlights a disparity between individuals in their capacity to adjust to ice break-up date, late breeders having a lower breeding success than early breeders. We speculate that breeding success of both species may therefore decline should a consistent trend towards earlier springs occur.

  • 4.
    Arzel, Céline
    et al.
    Frankrike.
    Dessborn, Lisa
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap.
    Pöysä, Hannu
    Finland.
    Elmberg, Johan
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap.
    Nummi, Petri
    Finland.
    Sjöberg, Kjell
    SLU, Umeå.
    Effect of the timing of spring thaw on the breeding performance in two sympatric waterbirds species2012Ingår i: Third Pan-European Duck Symposium: abstract book and programme, 2012, s. 51-Konferensbidrag (Refereegranskat)
  • 5.
    Brochet, Anne-Laure
    et al.
    CNERA Avifaune migratrice, Office National de la Chasse et de la Faune Sauvage, Arles.
    Dessborn, Lisa
    Högskolan Kristianstad, Sektionen för lärande och miljö.
    Legagneux, P.
    Département de Biologie, Université Laval, Pavillon Vachon.
    Elmberg, Johan
    Högskolan Kristianstad, Sektionen för lärande och miljö.
    Gauthier-Clerc, M.
    Centre de Recherche de la Tour du Valat, Arles.
    Fritz, H.
    Université Claude Bernard Lyon 1, CNRS UMR 5558 Biométrie et Biologie Evolutive, Université de Lyon, Villeurbanne.
    Guillemain, M.
    CNERA Avifaune migratrice, Office National de la Chasse et de la Faune Sauvage, Arles.
    Is diet segregation between dabbling ducks due to food partitioning?: a review of seasonal patterns in the Western Palearctic2012Ingår i: Journal of Zoology, ISSN 0952-8369, E-ISSN 1469-7998, Vol. 286, nr 3, s. 171-178Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Within the paradigm of resource-limited competition-structured communities, dabbling ducks (Anas spp.) have been used as a textbook example of how morphological differences, notably bill lamellar density and body length, may allow sympatric species to partition food and hence coexist. We reviewed all accessible diet studies from the Western Palearctic for three closely related dabbling duck species, mallard (Anas platyrhynchos), pintail (A.?acuta) and teal (A.?crecca), and present a comprehensive list of the food items (invertebrates, seeds, vegetative parts of plants) ingested. To assess the circumannual perspective of niche separation, we evaluated size distribution of ingested seeds among seasons and duck species. There was a significant difference among duck species in mean size and mass of ingested seeds, as well as in diet composition, with the largest seeds consumed by the largest species (mallard) with the coarsest bill filter apparatus (lamellae), and the smallest seeds by the smallest species (teal) with the finest bill lamellae. However, no effect of season was found, suggesting consistent diet segregation among species throughout the annual cycle of ducks and over large geographical areas. We argue that the patterns of food size separation between the three species are compatible with the idea of coexistence under interspecific competition.

  • 6.
    Dessborn, Lisa
    et al.
    Högskolan Kristianstad, Sektionen för lärande och miljö.
    Brochet, A. L.
    Office National de la Chasse et de la Faune Sauvage, CNERA Avifaune Migratrice, La Tour du Valat, Le Sambuc, Arles.
    Elmberg, Johan
    Högskolan Kristianstad, Sektionen för lärande och miljö.
    Legagneux, P.
    Département de Biologie and Centre d’Études Nordiques, Pavillon Vachon Université Laval, Québec.
    Gauthier-Clerc, M.
    Centre de Recherche de la Tour du Valat, Le Sambuc, Arles,.
    Guillemain, M.
    Office National de la Chasse et de la Faune Sauvage, CNERA Avifaune Migratrice, La Tour du Valat, Le Sambuc, Arles.
    Geographical and temporal patterns in the diet of pintail Anas acuta, wigeon Anas penelope, mallard Anas platyrhynchos and teal Anas crecca in the Western Palearctic2011Ingår i: European Journal of Wildlife Research, ISSN 1612-4642, E-ISSN 1439-0574, Vol. 57, nr 6, s. 1119-1129Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Dabbling ducks are important quarry species, and as a result, they are relatively well studied. Over the last century, considerable effort has been made to describe their diet and food requirements. In this review, we compile present knowledge about the diet of four widespread dabbling ducks (wigeon, pintail, mallard and teal) in the Western Palearctic. Previous diet research has a spatio-temporal bias towards autumn/winter and the western parts of Europe. The limited number of studies from the breeding season reveals an increase in invertebrates in the diet compared to other seasons, but with some differences between adults and ducklings. Adult ducks eat a larger proportion of benthic invertebrates, whereas ducklings feed relatively more on emerging invertebrates. The most important plant species (seeds) based on frequency occurrence was found to vary with a geographic gradient. Carex spp., Hordeum vulgare and Hippuris vulgaris are common in the diet of birds at northern latitudes, whereas taxa such as Oryza sativa, Potamogeton pectinatus and Scirpus spp. are common in the south. The reviewed studies are based on the contents of different parts of the digestive system and on a variety of methods to quantify food items. The variations in sampling techniques and shortage of articles from the breeding season and some geographic regions highlight the need for future studies. In the future, it is important to standardize sampling techniques to improve the possibility to compare studies and to obtain a more representative view of the diet of dabbling ducks in Europe.

  • 7.
    Dessborn, Lisa
    et al.
    Högskolan Kristianstad, Forskningsmiljön Man & Biosphere Health (MABH). Högskolan Kristianstad, Fakulteten för naturvetenskap, Avdelningen för miljö- och biovetenskap.
    Elmberg, Johan
    Högskolan Kristianstad, Forskningsmiljön Man & Biosphere Health (MABH). Högskolan Kristianstad, Fakulteten för naturvetenskap, Avdelningen för miljö- och biovetenskap.
    Bidrar gäss och svanar  till övergödning av våtmarker?2018Ingår i: Fakta för förvaltare: gäss och svanar: kunskapssammanställning om bete, övergödning, smittspridning och skyddsjakt / [ed] Johan Elmberg & Johan Månsson, Stockholm: Naturvårdsverket , 2018, s. 33-47Kapitel i bok, del av antologi (Övrigt vetenskapligt)
    Abstract [sv]

    • Gäss och svanar förekommer idag i större antal nära fler människor än någonsin tidigare, i Sverige och i övriga Västeuropa.

    • De ökande antalen leder ibland till problem och konflikter. På jordbruksmark kan gäss och svanar orsaka kostsamma skador på oskördade grödor. Hårt bete kan också påverka naturlig växtlighet och då bli ett naturvårdsproblem.

    • Gäss och svanar är vegetarianer och äter enbart blad, stjälkar, frön och rotdelar från växter, både på land och i vatten.

    • Bete på växande grödor kan också skapa intressekonflikter i områden där gäss samlas i stora antal, till exempel vid skyddade och restaurerade våtmarker.

    • Samtidigt bidrar gässen med många ekosystemtjänster, bland andra i form av naturupplevelser, jakt och kött. GÄSS OCH SVANAR SOM NÄRINGSTRANSPORTÖRER

    • Gäss och svanar har en relativt sett näringsfattig kost och en ganska ineffektiv matsmältning. Därför måste de äta mycket och producerar följaktligen stora  mängder avföring.

    • Dessa fåglar hittar mycket av sin föda på land, men vilar en stor del av dygnet  på våtmarker, där de också bajsar.

    • Under höst, vinter och vår gör gäss och svanar omfattande dagliga förflyttningar  mellan födoplatser och viloplatser. De blir därmed naturliga transportörer av näringsämnen till våtmarker och sjöar.ÖVERGÖDNING I VATTENDRAG

    • Under häckningstiden på sommaren är de flesta gäss och svanar glest utspridda över stora områden, samtidigt som flera arter häckar i våtmarker och sjöar som är naturligt näringsfattiga. Under dessa omständigheter är fåglarnas näringstransport från land till vattenmiljöer en naturlig process som snarast bidrar till ett rikare växt- och djurliv.

    • Våtmarker där gäss och svanar samlas i stora antal under höst, vinter och vår  är dock sällan näringsfattiga, och många av dem har redan problem med över- gödning genom näringsläckage från jordbruksmark. Övergödning kan leda till  algblomning, försämrad vattenkvalitet och andra oönskade förändringar i våtmarks- ekosystemet.

    • I områden som redan har problem med övergödning kan gäss och svanar göra att problemen ökar. Särskilt känsliga är små vattensamlingar med begränsat till- och utflöde, men också de som sommartid har kraftig avdunstning i kombination med stora antal fåglar.

    • En betydande del av den samlade näringstillförseln till våtmarker sker under den tid på året då växterna är inaktiva och alltså inte tar upp näringsämnen. Detta leder till att de senare antingen sedimenterar (och frigörs en annan årstid), eller att de transporteras nedströms och kan orsaka övergödning där.

    • Ett räkneexempel visar att 2 000 gäss som uppehåller sig i en våtmark i fyra månader kan bidra med 160 kg kväve och 40–80 kg fosfor. I vilken mån detta är problematiskt beror på hur mycket samma område påverkas av näringsläckage från jordbruk och andra mänskliga källor.

    • Kunskapssammanställningen ger exempel på åtgärder man kan vidta för att öka eller minska en våtmarks attraktivitet för gäss och svanar.

  • 8.
    Dessborn, Lisa
    et al.
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap.
    Elmberg, Johan
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap.
    Är ökande gåsstammar verkligen en skitsak?2007Ingår i: Vår fågelvärld, ISSN 0042-2649, Vol. 66, nr 7, s. 11-14Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 9.
    Dessborn, Lisa
    et al.
    Högskolan Kristianstad, Sektionen för lärande och miljö.
    Elmberg, Johan
    Högskolan Kristianstad, Sektionen för lärande och miljö.
    Englund, Göran
    Department of Ecology and Environmental Science, Umeå University.
    Pike predation affects breeding success and habitat selection of ducks2011Ingår i: Freshwater Biology, ISSN 0046-5070, E-ISSN 1365-2427, Vol. 56, nr 3, s. 579-589Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    1. Fish and ducks often belong to the same local food web, and several studies indicate that there is a general negative effect of fish on breeding ducks. This pattern has so far been addressed mainly within the framework of competition for common invertebrate prey, while predation by large fish as a force behind settlement and abundance patterns in ducks remains largely unknown. This is the first study to address the effect of fish predation on breeding ducks, isolated from that of competition, and the first experiment to explore the ability of ducks to identify and avoid lakes with high risk of fish predation. 2. We used a before-after control-impact design and 11 naturally fishless lakes. Waterfowl on the lakes were surveyed during the breeding season of 2005. Large adult pike (Esox lucius) were added to two lakes in early spring 2008, and waterfowl surveys were repeated on all 11 lakes. 3. Pike introduction did not affect the number of pairs on lakes during the nesting season in any of three focal duck species (mallard Anas platyrhynchos, teal Anas crecca, and goldeneye Bucephala clangula). During the brood-rearing season, however, there was a decrease in duck days in teal and goldeneye in lakes with pike, with similar trends observed in mallard. The number of goldeneye ducklings was also significantly lower in lakes with pike. We were unable to determine whether the response was attributable to direct pike predation or to broods leaving experimental lakes, but in either case, our study demonstrates high fitness costs for ducks breeding on lakes with pike. 4. The apparent inability of nesting ducks to detect pike and the clear fitness implications may influence the annual recruitment of ducks on a larger scale as pike are both common and widespread. Vegetation complexity and food abundance are likely to be of overriding importance when breeding ducks are choosing a nesting site. As pike have a strong influence on breeding birds, relying on vegetation and cues of food abundance, while ignoring indicators of predation risk from fish, could lead to lakes with pike acting as an ecological trap.

  • 10.
    Dessborn, Lisa
    et al.
    Högskolan Kristianstad, Sektionen för hälsa och samhälle.
    Elmberg, Johan
    Högskolan Kristianstad, Sektionen för lärande och miljö.
    Englund, Göran
    Department of Ecology and Environmental Science, Umeå University.
    The effects of pike predation on lake use and reproductive success of ducks: an experimental study in boreal lakes2009Ingår i: Abstracts, 2nd Pan-European Duck Symposium, 2009, s. 36-Konferensbidrag (Refereegranskat)
  • 11.
    Dessborn, Lisa
    et al.
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap.
    Elmberg, Johan
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap.
    Nummi, Petri
    Finland.
    Pöysä, Hannu
    Finland.
    Sjöberg, Kjell
    SLU, Umeå.
    Hatching in dabbling ducks and emergence in Chironomids: a case of predator-prey synchrony?2011Konferensbidrag (Refereegranskat)
  • 12.
    Dessborn, Lisa
    et al.
    Högskolan Kristianstad, Sektionen för lärande och miljö.
    Elmberg, Johan
    Högskolan Kristianstad, Sektionen för lärande och miljö.
    Nummi, Petri
    Department of Forest Ecology, University of Helsinki.
    Pöysä, Hannu
    Finnish Game and Fisheries Research Institute, Joensuu Game and Fisheries Research.
    Sjöberg, Kjell
    Department of Wildlife, Fish and Environmental Studies, Swedish University of Agricultural Sciences, Umeå.
    Hatching in dabbling ducks and emergence in chironomids: a case of predator-prey synchrony?2009Ingår i: Hydrobiologia, ISSN 0018-8158, E-ISSN 1573-5117, Vol. 636, nr 1, s. 319-329Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    It has been hypothesized that dabbling ducks (Anas spp.) time breeding to coincide with annual regional peaks in emerging dipterans, especially Chironomidae, which are important prey for newly hatched ducklings. However, this hypothesis has never been evaluated in a replicated lake-level study, including year effects in emergence patterns. We collected duck and invertebrate data from 12 lakes during the nesting seasons 1989-1994 in a watershed in southern Finland. The oligotrophic study lakes are typical of the boreal Holarctic, as are the three focal duck species: mallard Anas platyrhynchos L., widgeon Anas penelope L and teal Anas crecca L. Hatching of ducklings showed a clear peak in relation to ambient phenology (annual ice-out date of lakes), whereas chironomid emergence was more erratic and showed no clear peak at the lake level, although total watershed-level emergence was somewhat higher before and long after the duck hatching peak. Thus, we find no evidence that ducklings hatch in synchrony with abundance peaks of emerging chironomids. There was large within-year temporal variation in chironomid emergence among lakes, but this was not correlated with ambient temperature. The rank of individual lakes with respect to the abundance of emerging chironomids was consistent among as well as within years, a predictability that ought to make adaptive lake choice by ducks possible. On the lake level, there was a positive correlation between the total amount of emerging chironomids and brood use. We argue that emergence patterns of chironomids on typical boreal lakes are neither compressed nor predictable enough to be a major selective force on the timing of egg-laying and hatching in dabbling ducks. Despite spatial (among-lake) patterns of abundance of emerging chironomids being predictable within and among years, the observed pattern of brood use suggests that other factors, e.g. habitat structure, also affect lake choice.

  • 13.
    Dessborn, Lisa
    et al.
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap.
    Englund, Göran
    Umeå universitet.
    Elmberg, Johan
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap.
    Arzel, Céline
    Frankrike.
    Responses of mallard ducklings towards aerial, aquatic and terrestrial predators2012Ingår i: Third Pan-European Duck Symposium: abstract book and programme, 2012, s. 17-Konferensbidrag (Refereegranskat)
  • 14.
    Dessborn, Lisa
    et al.
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Man and Biosphere Health (MABH).
    Englund, Göran
    Department of Ecology and Environmental Science, Umeå University.
    Elmberg, Johan
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Man and Biosphere Health (MABH).
    Arzél, Celine
    Section of Ecology, Department of Biology, University of Turku.
    Innate responses of mallard ducklings towards aerial, aquatic and terrestrial predators2012Ingår i: Behaviour, ISSN 0005-7959, E-ISSN 1568-539X, Vol. 149, nr 13-14, s. 1299-1317Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Reproductive success in ducks is strongly influenced by predation on the breeding grounds. Ducklings are targeted by a range of terrestrial, aerial and aquatic predators, giving a strong selective advantage to individuals and broods that have effective ways to avoid predation. In experiments on naive mallard (Anas platyrhynchos) ducklings without an accompanying adult female we investigated the innate ability to identify and avoid threats at varying intensity from aerial, aquatic and terrestrial predators. Ducklings displayed increased vigilance in response to pre-recorded calls of predatory birds, representing a low level of threat. They did not react to visual and olfactory stimuli generated by motionless northern pike (Esox lucius). Neither did they show a strong response to caged American mink (Neovison vison) (visual and olfactory stimuli), although they avoided the area with the mink, indicating a certain level of recognition. High intensity threats were simulated by staging attacks from aerial (goshawk, Accipiter gentilis) and aquatic predators (northern pike). The aerial attack made ducklings dive and scatter under water, whereas the response to attack by pike was to run on the water and scatter in different directions. The lack of response to a ‘passive’ pike and the rather weak avoidance of mink indicate that olfactory cues are not as important in identifying a potential predatory threat by ducklings as are auditory cues. Visual cues appear to be of little importance unless they are combined with movement, and a clear response is only triggered when the intensity of predator threat is high. Mallard ducklings, thus, show an innate capacity to adjust anti-predator behaviour to different predator types and to threat intensity. Our study highlights the general trade-off between foraging needs and predator avoidance, but also second-order trade-offs in which innate avoidance behaviour towards one type of predator may increase predation risk from another.

  • 15.
    Dessborn, Lisa
    et al.
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Man & Biosphere Health (MABH).
    Hessel, Rebecca
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Man & Biosphere Health (MABH).
    Elmberg, Johan
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Man & Biosphere Health (MABH).
    Geese as vectors of nitrogen and phosphorus to freshwater systems2016Ingår i: INLAND WATERS, ISSN 2044-2041, E-ISSN 2044-205X, Vol. 6, nr 1, s. 111-122Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Many goose populations have increased dramatically over the past decades, which may influence inland waters used as roost sites. We reviewed the role of geese in the influx of nitrogen and phosphorus to freshwater systems. Several methods have been used to estimate guanotrophication impacts of geese. Water and sediment analysis have been conducted in areas of high and low geese presence; however, productive wetlands tend to attract more birds, and the causality is therefore ambiguous. Faecal addition experiments have attempted to estimate the impacts of droppings on water chemistry, sediments, algal growth, or invertebrate densities. The most common method of estimating goose guanotrophication is by extrapolation, usually based on multiplication of faecal production and its nutrient content. Based on such studies and those including information about daily migration patterns, we developed an approach to improve estimates of the nutrient contribution of geese. The relative role of geese in wetland eutrophication is also affected by the influx from alternative sources. The greatest guanotrophication impacts are likely found in areas with few alternative nutrient sources and with large goose flocks. Limited inflow and outflow of a freshwater system or a scarcity of wetland roosts may also increase problems at a local scale. Although several studies have looked at the impacts of geese on, for example, water chemistry or soil sediments, the effects are often smaller than expected, in part because no study to date has assessed the ecosystem response by including impacts on all levels, including water nutrient levels, nutrient sedimentation, chlorophyll content, and zooplankton response.

  • 16.
    Dessborn, Lisa
    et al.
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Man & Biosphere Health (MABH).
    Rönkä, M
    Arzel, C
    Elmberg, Johan
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Man & Biosphere Health (MABH).
    Sinisorsanpoikaset välttelevät synnynnäisesti erityyppisiä petoja2016Ingår i: Soumen Riista, ISSN 0355-0656, Vol. 62, s. 43-54Artikel i tidskrift (Refereegranskat)
  • 17.
    Elmberg, Johan
    et al.
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Man & Biosphere Health (MABH).
    Dessborn, Lisa
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap.
    Arzel, Céline
    Andungar har bra koll när faran hotar2014Ingår i: Vår fågelvärld, ISSN 0042-2649, Vol. 73, nr 3, s. 34-35Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 18.
    Elmberg, Johan
    et al.
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Man & Biosphere Health (MABH).
    Dessborn, Lisa
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap.
    Arzel, Céline
    Så undviker andungarna rovdjuren2015Ingår i: Svensk jakt, ISSN 0039-6583, Vol. 153, nr 6, s. 38-40Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 19.
    Elmberg, Johan
    et al.
    Högskolan Kristianstad, Sektionen för lärande och miljö.
    Dessborn, Lisa
    Högskolan Kristianstad, Sektionen för lärande och miljö.
    Englund, G.
    Fisk och änder konkurrerar med varandra2012Ingår i: Fåglar i Västerbotten, ISSN 0348-1166, Vol. 37, nr 1, s. 19-21Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 20.
    Elmberg, Johan
    et al.
    Högskolan Kristianstad, Sektionen för lärande och miljö.
    Dessborn, Lisa
    Högskolan Kristianstad, Sektionen för lärande och miljö.
    Englund, Göran
    Department of Ecology and Environmental Science, Umeå University.
    Presence of fish affects lake use and breeding success in ducks2010Ingår i: Hydrobiologia, ISSN 0018-8158, E-ISSN 1573-5117, Vol. 641, nr 1, s. 215-223Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Several previous studies indicate that presence of fish has negative effects on waterbirds breeding on lakes, owing either to competition for common invertebrate prey or fish predation on ducklings/chicks. However, others have reported results to the contrary and it remains unresolved what factors trigger, inhibit, and modulate fish-waterbird interactions. The present study was designed to test the effect of fish presence per se, with a minimum of variation in possibly confounding environmental variables. Thus, after stratifying for area, depth, altitude, pH, and total phosphorus we compared 13 lakes with and 12 without fish (mainly pike Esox lucius and perch Perca fluviatilis) with respect to (i) general species richness of waterbirds, (ii) species-specific utilization and breeding success of two dabbling ducks (mallard Anas platyrhynchos and teal Anas crecca) and a diving duck (goldeneye Bucephala clangula). General species richness of waterbirds was higher on fishless lakes. Overall use (bird days) and brood number of teal and goldeneye were higher on fishless lakes. The latter also had more benthic and free-swimming prey invertebrates compared to lakes with fish. Mallard use, mallard brood number, and abundance of emerging insects did not differ between lake groups. Generalized linear models including fish presence as factor and considering seven environmental variables as covariates, confirmed that all waterbird variables except mallard days and broods were negatively correlated to fish presence. There was also a residual positive relationship of lake area on general species richness, teal days, and teal broods. Our data demonstrate a stronger effect of fish presence on diving ducks and small surface feeding ducks than on large surface-feeding ducks. We argue that observed patterns were caused by fish predation on ducks rather than by fish-duck competition for common prey.

  • 21.
    Elmberg, Johan
    et al.
    Högskolan Kristianstad, Sektionen för lärande och miljö.
    Dessborn, Lisa
    Högskolan Kristianstad, Sektionen för lärande och miljö.
    Gunnarsson, Gunnar
    Högskolan Kristianstad, Sektionen för lärande och miljö.
    Nummi, Petri
    Helsingfors universitet.
    Pöysä, Hannu
    Finska vilt- och fiskeriforskningsinstitutet.
    Sjöberg, Kjell
    Sveriges lantbruksuniversitet, Umeå.
    Forskare vill ha inventering före fågeljakt2008Ingår i: Jakt och Jägare, ISSN 1401-8306, nr 6, s. 45-Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 22.
    Guillemain, Matthieu
    et al.
    Office National de la Chasse et de la Faune Sauvage, CNERA Avifaune Migratrice, La Tour du Valat, Le Sambuc, Arles.
    Pöysä, Hannu
    Finnish Game and Fisheries Research Institute, Joensuu Game and Fisheries Research.
    Fox, Anthony D.
    Thomas Eske Holm & Thomas Kjær Christensen, Department of Bioscience, Aarhus University.
    Arzel, Céline
    Department of Biology, Section of Ecology, University of Turku.
    Dessborn, Lisa
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Man and Biosphere Health (MABH).
    Ekroos, Johan
    Centre for Environmental and Climate Research, Lund.
    Gunnarsson, Gunnar
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Man and Biosphere Health (MABH).
    Eske Holm, Thomas
    Thomas Eske Holm & Thomas Kjær Christensen, Department of Bioscience, Aarhus University.
    Kjær Christensen, Thomas
    Thomas Eske Holm & Thomas Kjær Christensen, Department of Bioscience, Aarhus University.
    Lehikoinen, Aleksi
    Department of Biological and Environmental Sciences, University of Helsinki.
    Mitchell, Carl
    Wildfowl & Wetlands Trust, Slimbridge.
    Rintala, Jukka
    Finnish Game and Fisheries Research Institute, Helsinki.
    Pape Møller, Anders
    Laboratoire Ecologie Systématique et Evolution (UMR 8079), Université Paris-Sud XI, Orsay.
    Effects of climate change on European ducks: what do we know and what do we need to know?2013Ingår i: Wildlife Biology, ISSN 0909-6396, E-ISSN 1903-220X, Vol. 19, nr 4, s. 404-419Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The consequences of climate change for bird populations have received much attention in recent decades, especially amongst cavity-nesting songbirds, yet little has been written on ducks (Anatidae) despite these being major elements of wetland diversity and important quarry species. This paper reviews the major known consequences of climate change for birds in general, and relates these to the limited information available specifically for ducks. Climate change can influence migration distance and phenology, potentially affecting patterns of mortality, as well as distribution and reproductive success in ducks. Studies addressing effects of climate change are, however, restricted to very few duck species, including mallardAnas platyrhynchos and common eider Somateria mollissima. Shifts in winter duck distributions have been observed, whereas the mismatch hypothesis (mistiming between the periods of peak energy requirements for young and the peak of seasonal food availability) has received limited support with regard to ducks. We propose a range of monitoring initiatives, including population surveys, breeding success monitoring schemes and individual duck marking, which should later be integrated through population modelling and adaptive management to fill these gaps.

  • 23.
    Gunnarsson, Gunnar
    et al.
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Man and Biosphere Health (MABH).
    Elmberg, Johan
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Man and Biosphere Health (MABH).
    Dessborn, Lisa
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Man and Biosphere Health (MABH).
    Jonzén, Niclas
    Department of Theoretical Ecology, Lund University.
    Pöysä, Hannu
    Finnish Game and Fisheries Research Institute, Joensuu.
    Valkama, Jari
    Finnish Museum of Natural History, Helsinki.
    Survival estimates, mortality patterns, and population growth of Fennoscandian mallards Anas platyrhynchos2008Ingår i: Annales Zoologici Fennici, ISSN 0003-455X, E-ISSN 1797-2450, Vol. 45, nr 6, s. 483-495Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Long-term mallard capture-recapture data from Sweden and Finland were analyzed to describe temporal mortality patterns and reasons. We used program MARK and Seber models to estimate annual survival (S) and recovery (r) rates. Survival rates were used in a Monte Carlo simulation to evaluate the correspondence between observed and predicted annual population sizes of a Finnish sub-population. About 90% of recovered birds died from hunting. Most recoveries were from the hunting season, and more males than females were shot. Predation was the most common cause of natural mortality. Finnish capture-recapture data fitted best the global model in which survival and recovery vary with age and sex. Annual survival and recovery rates for adult and juvenile males and females were overlapping, ranging from 0.46 to 0.90 (survival) and 0.07 to 0.17 (recovery), whereas pulli had lower survival rates (0.21-0.42). Pulli that were successfully sexed at the time of ringing had higher recovery rates (female pulli: 0.23; male pulli: 0.32) than juveniles and adults. Density-dependent fledgling production was detected in the Finnish sub-population and was accounted for in the Monte Carlo simulation, which estimated predicted breeding population size quite well, although one of the observed annual values (2003) fell outside the 95% confidence limits.

  • 24.
    Gunnarsson, Gunnar
    et al.
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Man and Biosphere Health (MABH).
    Elmberg, Johan
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Man and Biosphere Health (MABH).
    Pöysä, Hannu
    Joensuu Game and Fisheries Research, Finnish Game and Fisheries Research Institute.
    Sjöberg, Kjell
    Department of Wildlife, Fish, and Environmental Studies, Swedish University of Agricultural Sciences, Umeå.
    Dessborn, Lisa
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Man and Biosphere Health (MABH).
    Arzel, Céline
    Section of Ecology, Department of Biology, Turku University.
    Density dependence in ducks: a review of the evidence2013Ingår i: European Journal of Wildlife Research, ISSN 1612-4642, E-ISSN 1439-0574, Vol. 59, nr 3, s. 305-321Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Density dependence (DD) is a central concept in population ecology and in the management of harvested populations. For example, DD underpins the idea of additive versus compensatory mortality and is a tenet in the paradigm of resource limitation and regulation. Yet the prevalence and importance of DD remains disputed in most organisms, including ducks, which are focal in game management, conservation and zoonotic diseases. Based on 154 data entries from 54 studies in the peer-reviewed literature, we here synthesize and evaluate the prevalence of DD in breeding ducks in relation to (1) species and guild (dabbling versus diving ducks), (2) stage in the breeding cycle (nesting, duckling, recruitment) or, alternatively, in terms of population dynamics, (3) study type (descriptive/nonmanipulative versus experimental), (4) continent (Europe versus North America), (5) spatial level (wetland, landscape, regional, continental) and (6) biome (tundra, boreal, nemoral, prairie, mediterranean). One conclusion from this review is that it is difficult to find general patterns about the prevalence of DD unless data are broken down to subsets, for example, to stage or spatial level. With respect to stage, DD effects occur at all stages of the breeding cycle. During the nesting and duckling stages, the frequency of cases detecting versus not detecting DD is roughly the same. However, in cases referring to the recruitment stage, i.e. to survival of fledged ducks until 1 year old at the most, DD was the rule, suggesting that DD processes may operate mainly outside the breeding season. Further subdivision of data shows that spatial scale is important to the prevalence of DD in nesting ducks—rare on the wetland level and more common on higher spatial levels. In studies of population dynamics (i.e. based on time series data only), DD was more often found in diving than in dabbling ducks. This corroborates previous suggestions that dabbling ducks largely should be considered as r-selected species, in contrast to more K-selected diving ducks, which start to reproduce at an older age and often breed in more stable wetland environments where resources may be easier to track and populations thus often are closer to carrying capacity. However, the picture of DD in ducks is far from complete, and knowledge gaps for future studies to address include: (a) data from Russia, which holds a large part of the breeding ducks in the Northern hemisphere, (b) experimental studies on more species to separate density-dependent factors from other drivers of population change and to tease apart spatial and temporal interactions in the underlying processes, (c) time series analyses addressing population dynamics, especially from outside North America, (d) studies relating duck numbers to limiting resources, which arguably is the most relevant measure of density, (e) the timing of DD processes in relation to harvest and natural mortality.

  • 25.
    Hansson, Lars-Anders
    et al.
    Lund University.
    Ekvall, Mattias K.
    Lund University.
    Ekvall, Mikael T.
    Lund University.
    Ahlgren, Johan
    Lund University.
    Sidemo Holm, William
    Lund University.
    Dessborn, Lisa
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Man & Biosphere Health (MABH).
    Brönmark, Christer
    Lund University.
    Experimental evidence for a mismatch between insect emergence and waterfowl hatching under increased spring temperatures2014Ingår i: Ecosphere, ISSN 2150-8925, E-ISSN 2150-8925, Vol. 5, nr 9, s. 120-Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    By combining a large-scale experimental assessment on timing of insect emergence with longtermmonitoring of waterfowl hatching date, we here show that insect emergence is mainly driven bytemperature, whereas there is only a weak effect of increasing spring temperatures on inter-annualvariability in observations of waterfowl chicks. Hence, a change in timing of the mass-emergence of insectsfrom lakes and wetlands, which is the crucial food source for waterfowl chicks, will likely result in aconsumer/resource mismatch in a future climate change perspective. Specifically, we experimentally showthat a moderate increase in temperature of 38C above ambient, expected to occur within 25–75 years, leadsto a considerably (2 weeks) earlier, and more pronounced, peak in insect emergence (Chironomus sp).Moreover, by utilizing long-term Citizen Science databases, ranging over several decades, we also showthat common waterfowl species are unable to significantly adjust their reproduction to fit futuretemperature increase. Hence, based on our data we predict a future mismatch between insect emergenceand waterfowl species basing their reproduction on temperature. This will have a profound impact onreproductive success and population dynamics of many aquatic birds, as well as on freshwaterbiodiversity.

  • 26.
    Holopainen, Sari
    et al.
    Finland.
    Arzel, Céline
    Finland.
    Dessborn, Lisa
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap.
    Elmberg, Johan
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap.
    Gunnarsson, Gunnar
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap.
    Nummi, Petri
    Finland.
    Pöysä, Hannu
    Finland.
    Sjöberg, Kjell
    SLU.
    Habitat use in ducks breeding in boreal freshwater wetlands: a review2015Ingår i: European Journal of Wildlife Research, ISSN 1612-4642, E-ISSN 1439-0574, Vol. 61, nr 3, s. 339-363Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Breeding habitats strongly influence duck reproduction and survival. The boreal biome harbours a large share of the worlds wetlands, which are important breeding sites for several duck species. Based on 98 studies in the peer-reviewed literature, we here synthesize and evaluate which habitat characteristics affect habitat use and reproduction of ducks breeding in boreal freshwater wetlands with respect to (1) species and guild (dabbling, diving and piscivorous ducks) and (2) breeding cycle stage (settling by pairs, nesting and brood rearing). We consider the following aspects related to habitat: wetland morphology and spatial aggregation, water characteristics, habitat structure and vegetation, and biotic interactions. Most of the peer-reviewed studies of duck habitat use in boreal wetlands are from North America and Fennoscandia, while nearly half of the boreal area lacks such studies. Few species dominate research thus far while several others have not been studied at all. Nest site use and success are mainly related to predator avoidance. Food resources and habitat structure are the key characteristics affecting habitat use by duck pairs and broods as well as breeding success, although there are differences between duck guilds. Among the commonly studied variables, there is little evidence that water characteristics affect duck habitat use or survival. The most notable knowledge gaps are found in the effects of anthropogenic activities on habitat use and breeding success of ducks. Because boreal breeding environments are increasingly affected by human activities, we underline the need for future studies combining climate variation with natural and anthropogenic disturbances.

  • 27. Islam, Kamal Ziaul
    et al.
    Islam, Md Sirajul
    North South University, Dhaka.
    Lacoursière, Jean O.
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Man & Biosphere Health (MABH).
    Dessborn, Lisa
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Man & Biosphere Health (MABH).
    Low cost rainwater harvesting: an alternate solution to salinity affected coastal region of Bangladesh2014Ingår i: American Journal of Water Resources, ISSN 2333-4819, Vol. 2, nr 6, s. 141-148Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This study investigated the prospect of rainwater harvesting as a low cost alternative potable water supply option along the coastal region of Bangladesh, which is considered as one of the most vulnerable countries in the world due to climate change and resulting sea level rise. Because of increasing salinity intrusion, potable water scarcity become severe at the south-western coastal region of the country. The study area for this investigation was Patkelghata in Satkhira district of Bangladesh located in the same zone. The Satkhira district averages nearly 1,710 mm rainfall per year. Based on rural housing pattern of the region, a rainwater harvesting system is proposed, which consists of roof catchment, gutters, down pipes, first flush devices, filter chamber and storage tank. The minimum catchment area was assumed to be 6 m2 and storage tank of 2000 liter capacity. Data was collected on the present state of freshwater supply, sources and quality, average rainfall in the region, dry spell period, family size, water use nature, rain water quality and material to be used for storage, etc. Rainwater quality was also tested and the parameters were found to be within Bangladesh’s standard limit. After a detail calculation, an approximate cost was assumed to be $171 for building and operation of the whole system. A questionnaire survey was also conducted on views and opinion of local people to understand the problems, prospects and the popularity of rainwater harvesting in Bangladesh.

  • 28. Nummi, R.
    et al.
    Pöysä, H.
    Elmberg, Johan
    Högskolan Kristianstad, Sektionen för lärande och miljö.
    Dessborn, Lisa
    Högskolan Kristianstad, Sektionen för lärande och miljö.
    Sjöberg, K.
    Ravinnon ja ympäristön rakenteen merkitys puolisukeltajasorsien poikueille2010Ingår i: Suomen Riista, ISSN 0355-0656, Vol. 56, s. 16-25Artikel i tidskrift (Refereegranskat)
  • 29.
    Pöysä, Hannu
    et al.
    Finnish Game and Fisheries Research Institute, Joensuu Game and Fisheries Research.
    Dessborn, Lisa
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Man and Biosphere Health (MABH).
    Elmberg, Johan
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Man and Biosphere Health (MABH).
    Gunnarsson, Gunnar
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Man and Biosphere Health (MABH).
    Nummi, Petri
    Department of Forest Sciences, University of Helsinki.
    Sjöberg, Kjell
    Department of Wildlife, Fish, and Environmental Studies, Swedish University of Agricultural Sciences, Umeå.
    Suhonen, Sari
    Department of Forest Sciences, University of Helsinki.
    Söderquist, Pär
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Naturvetenskap. Högskolan Kristianstad, Forskningsmiljön Man and Biosphere Health (MABH).
    Harvest mortality in North American mallards: a reply to Sedinger and Herzog2013Ingår i: Journal of Wildlife Management, ISSN 0022-541X, E-ISSN 1937-2817, Vol. 77, nr 4, s. 653-654Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Sedinger and Herzog (2012) evaluated the evidence for the impact harvest mortality may have on North American duck populations. While doing that, they questioned our review (Pöysä et al. 2004) and conclusion that harvest mortality in North American mallards (Anas platyrhynchos) may have shifted from compensatory to additive over the period from the 1960s to the 1980s. In this reply, we correct Sedinger and Herzog's misrepresentations of our 2004 paper and argue that our interpretations of the results published at that time have not been invalidated.

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